CP Violation in Same-sign Dilepton Production at the LHC

Abstract

If the neutrino is a Majorana particle, low-energy lepton-number-violating (LNV) processes, such as neutrinoless double-beta ($0\nu \beta \beta$) decay, are possible. It may also be possible to observe high-energy $0\nu \beta \beta$-like LNV processes at the LHC. These are distinguished by the presence of same-sign dileptons in the final state (e.g., $\bar{u}d\to t\bar{b}{e}^{-}{\mu }^{-}$). In this paper, we show that CP-violating triple products (TPs) may be present in the process, and may be measurable at the LHC. If a nonzero TP were observed, it would give us much information about the underlying new physics (NP). We would know that there are (at least) two interfering NP amplitudes, with different weak phases and different Lorentz structures. And if we had some knowledge of the NP, e.g., by direct production of NP particles, we could get information about the magnitudes and relative phases of its couplings.

arXiv comment8 pages, 1 figure. Important changes to the paper: we now focus on a single NP model, and include a detailed discussion about the prospects for the observation of TPs at the LHC

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